Derek

Derek is a clerk at Melvin's Sporting Goods.

When Stan injects the family with his DNA in "Dancin' A-With My Cell", they not only acquire his chin, but his bad attitude as well. After getting punched in the nuts by both Steve and Hayley, he goes to Melvin's to buy an athletic cup, but finds that they've injected everyone in town when he gets snapped at by Derek, who in turn gets snapped at by the manager for 'helping' Stan.